| http://www.w3.org/ns/prov#value | - a demultiplexer arranged to couple individual wavelengths in an input optical WDM signal to N respective demultiplexer outputs, where N is an integer greater than one, a first free space region having a left edge and a right edge, N planar beam steerers arranged along the left edge of the first free space region and each connected to a different one of the N demultiplexer outputs, K gratings arran
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